A Prospective, Single-Arm, Phase II Study of Autologous Stem Cell Transplantation Combined With BCMA CAR-T Therapy Followed by GPRC5D/CD3 Bispecific Antibody Maintenance in Transplant-Eligible Patients With Primary Plasma Cell Leukemia
This is a prospective, single-arm, phase II study to evaluate the efficacy and safety of autologous stem cell transplantation combined with BCMA CAR-T therapy followed by GPRC5D/CD3 bispecific antibody maintenance in transplant-eligible patients with primary plasma cell leukemia.
• Age ≥ 18 years and ≤ 70 years.
• Participants with documented newly-diagnosed primary plasma cell leukemia according to IMWG diagnostic criteria.
• Measurable disease at screening, defined as: Serum M-protein level ≥1.0 g/dL or urine M-protein level ≥200 mg/24 hours; or Light chain MM without measurable disease in serum or urine: serum Ig free-light chain (FLC) ≥10 mg/dL and abnormal serum Ig kappa lambda FLC ratio.
• Patients deemed eligible for high-dose chemotherapy with ASCT.
• Tumor cells were BCMA and GPRC5D positive.
• Serum total bilirubin \<2 x upper limit of normal (ULN), serum AST and ALT \<3 x ULN, creatinine clearance ≥ 30mL/min (Cockroft-Gault formula).
• Informed Consent/Assent: All subjects have the ability to understand and the willingness to sign a written informed consent.